Patti Hearst threw a baby shower for daughter Gillian Hearst Simonds, co-hosted by Gillian’s sister Lydia, at Alice’s Tea Cup, where the expectant mother made a surprise announcement: She’s weighing an offer to pose nude. But before you start thinking Demi Moore, the pregnant portrait — to be shot by Greg Gorman, whose subjects have included Halle Berry and Penelope Cruz — would be for Hearst’s private collection. “Patti’s eyebrows raised,” said a spy. Activities at the baby bash included creating hand-painted onesies, among them one by Kimberly Rockefeller that read, “Citizen Kute.” A topic of debate among guests, including Amanda Hearst, Billy Norwich and R. Couri Hay, was baby names; “Harper Randolph” was a favorite.